gecko-dev/layout/style/nsIStyleRuleProcessor.h

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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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* Version: NPL 1.1/GPL 2.0/LGPL 2.1
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* for the specific language governing rights and limitations under the
* License.
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* The Original Code is mozilla.org code.
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* The Initial Developer of the Original Code is
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* Portions created by the Initial Developer are Copyright (C) 1998
* the Initial Developer. All Rights Reserved.
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* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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#ifndef nsIStyleRuleProcessor_h___
#define nsIStyleRuleProcessor_h___
#include <stdio.h>
#include "nsISupports.h"
#include "nsIPresContext.h" // for nsCompatability
#include "nsILinkHandler.h"
#include "nsString.h"
class nsISizeOfHandler;
class nsIStyleSheet;
class nsIStyleContext;
class nsIPresContext;
class nsIContent;
class nsIStyledContent;
class nsISupportsArray;
class nsIAtom;
class nsICSSPseudoComparator;
class nsRuleWalker;
// The implementation of the constructor and destructor are currently in
// nsCSSStyleSheet.cpp.
struct RuleProcessorData {
RuleProcessorData(nsIPresContext* aPresContext,
nsIContent* aContent,
nsRuleWalker* aRuleWalker,
nsCompatibility* aCompat = nsnull);
// NOTE: not |virtual|
~RuleProcessorData();
void* operator new(size_t sz, nsIPresContext* aContext) CPP_THROW_NEW {
void* result = nsnull;
aContext->AllocateFromShell(sz, &result);
return result;
}
void Destroy(nsIPresContext* aContext) {
this->~RuleProcessorData();
aContext->FreeToShell(sizeof(RuleProcessorData), this);
};
const nsString* GetLang();
nsIPresContext* mPresContext;
nsIContent* mContent;
nsIContent* mParentContent; // if content, content->GetParent()
nsRuleWalker* mRuleWalker; // Used to add rules to our results.
nsIContent* mScopedRoot; // Root of scoped stylesheet (set and unset by the supplier of the scoped stylesheet
nsIAtom* mContentTag; // if content, then content->GetTag()
nsIAtom* mContentID; // if styled content, then styledcontent->GetID()
nsIStyledContent* mStyledContent; // if content, content->QI(nsIStyledContent)
PRPackedBool mIsHTMLContent; // if content, then does QI on HTMLContent, true or false
PRPackedBool mIsHTMLLink; // if content, calls nsStyleUtil::IsHTMLLink
PRPackedBool mIsSimpleXLink; // if content, calls nsStyleUtil::IsSimpleXLink
nsCompatibility mCompatMode; // Possibly remove use of this in SelectorMatches?
PRPackedBool mHasAttributes; // if content, content->GetAttrCount() > 0
PRPackedBool mIsChecked; // checked/selected attribute for option and select elements
nsLinkState mLinkState; // if a link, this is the state, otherwise unknown
PRInt32 mEventState; // if content, eventStateMgr->GetContentState()
PRInt32 mNameSpaceID; // if content, content->GetNameSapce()
RuleProcessorData* mPreviousSiblingData;
RuleProcessorData* mParentData;
protected:
nsAutoString *mLanguage; // NULL means we haven't found out the language yet
};
struct ElementRuleProcessorData : public RuleProcessorData {
ElementRuleProcessorData(nsIPresContext* aPresContext,
nsIContent* aContent,
nsRuleWalker* aRuleWalker)
: RuleProcessorData(aPresContext,aContent,aRuleWalker)
{
NS_PRECONDITION(aContent, "null pointer");
NS_PRECONDITION(aRuleWalker, "null pointer");
}
};
struct PseudoRuleProcessorData : public RuleProcessorData {
PseudoRuleProcessorData(nsIPresContext* aPresContext,
nsIContent* aParentContent,
nsIAtom* aPseudoTag,
nsICSSPseudoComparator* aComparator,
nsRuleWalker* aRuleWalker)
: RuleProcessorData(aPresContext, aParentContent, aRuleWalker)
{
NS_PRECONDITION(aPseudoTag, "null pointer");
NS_PRECONDITION(aRuleWalker, "null pointer");
mPseudoTag = aPseudoTag;
mComparator = aComparator;
}
nsIAtom* mPseudoTag;
nsICSSPseudoComparator* mComparator;
};
struct StateRuleProcessorData : public RuleProcessorData {
StateRuleProcessorData(nsIPresContext* aPresContext,
nsIContent* aContent,
PRInt32 aStateMask)
: RuleProcessorData(aPresContext, aContent, nsnull),
mStateMask(aStateMask)
{
NS_PRECONDITION(aContent, "null pointer");
}
const PRInt32 mStateMask; // |HasStateDependentStyle| for which state(s)?
// Constants defined in nsIEventStateManager.h .
};
// IID for the nsIStyleRuleProcessor interface {015575fe-7b6c-11d3-ba05-001083023c2b}
#define NS_ISTYLE_RULE_PROCESSOR_IID \
{0x015575fe, 0x7b6c, 0x11d3, {0xba, 0x05, 0x00, 0x10, 0x83, 0x02, 0x3c, 0x2b}}
/* The style rule processor interface is a mechanism to seperate the matching
* of style rules from style sheet instances.
* Simple style sheets can and will act as their own processor.
* Sheets where rule ordering interlaces between multiple sheets, will need to
* share a single rule processor between them (CSS sheets do this for cascading order)
*/
class nsIStyleRuleProcessor : public nsISupports {
public:
NS_DEFINE_STATIC_IID_ACCESSOR(NS_ISTYLE_RULE_PROCESSOR_IID)
// populate rule node tree with nsIStyleRule*
// rules are ordered, those with higher precedence are farthest from the root of the tree
NS_IMETHOD RulesMatching(ElementRuleProcessorData* aData,
nsIAtom* aMedium) = 0;
NS_IMETHOD RulesMatching(PseudoRuleProcessorData* aData,
nsIAtom* aMedium) = 0;
// Test if style is dependent on content state
NS_IMETHOD HasStateDependentStyle(StateRuleProcessorData* aData,
nsIAtom* aMedium,
PRBool* aResult) = 0;
#ifdef DEBUG
virtual void SizeOf(nsISizeOfHandler *aSizeofHandler, PRUint32 &aSize) = 0;
#endif
};
#endif /* nsIStyleRuleProcessor_h___ */